JPH086028Y2 - Quenching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a quenching apparatus for quenching a workpiece by immersing it in a quenching liquid in which water and glycol are mixed.

[Prior Art] A quenching apparatus using a mixture of water and glycol as a quenching solution is known for quenching a high-quality quenching work such as an aluminum alloy casting for aircraft without distortion (for example, JP-A-64- No. 36721).

 The structure of such a quenching apparatus is shown in FIG.

In FIG. 2, reference numeral 1 is a heating furnace for heating the work W to a high temperature of, for example, about 500 ° C. The work W is loaded and unloaded by a transporting device (not shown) when the door 2 is open. 5
Is a quenching tank containing a quenching solution in which a glycol aqueous solution, that is, water and glycol are mixed, and the quenching solution is held at a predetermined temperature (for example, 35 ° C.) by a temperature adjusting means (not shown). A cleaning tank 8 cleans the work W after quenching. The cleaning liquid is water. There is a spray method other than the immersion method shown in FIG. 2, but the essence does not change.

Therefore, the workpiece W heated to a high temperature is conveyed in the directions of arrows X and Y, rapidly cooled in the quenching tank 5 and subjected to solution treatment.
Subsequently, the quenched work W is cleaned in the cleaning tank 8 and then transferred to a hot water washing tank or the like.

By the way, the cleaning tank 8 is attached to the work W and hardened tank 5
The quenching liquid brought out from Then, not only the predetermined cleaning effect cannot be obtained, but also the amount of glycol in the quenching tank 5 decreases and the quenching quality deteriorates. For this reason, glycol must be supplemented, but there is a problem that the economic burden is large. Further, since glycol is mixed in the waste water from the cleaning tank 8, waste water treatment equipment is required, and the treatment cost becomes high. Further, when the work W taken out of the cleaning tank 8 without a post-washing tank is used as an intermediate product and the intermediate product is coated, the glycol attached in the cleaning tank 8 impairs the uniformity of the coating film. There is a problem of doing.

Here, the applicant has proposed that the glycol aqueous solution is, for example, 80 to
Focusing on the fact that water and glycol are separated when heated to an appropriate temperature of 85 ° C., a quenching device provided with a separation and recovery means 10 for reusing glycol and water is proposed (JP-A-64-36721).
No.)

This separating / collecting means 10 is, as shown in FIG.
And heating means 21 (pipe heater 22, temperature sensor 23, controller 24, control valve 25, drain trap 26) and pipe line 31 (glycol pipe 32, flow rate adjusting valve 33, water pipe 34) inside the cleaning tank 8. Of the liquid is separated into the separation tank 11 via the pump 9 and the feeding pipe 35.
Will be sent in.

Therefore, the liquid fed from the cleaning tank 8 is separated into the separation tank 11
A pipe heater 22 in which a heat source such as steam flows inside
It is heated to an appropriate temperature. Then, due to the difference in specific gravities, water is separated and recovered in the upper layer and glycol in the lower layer. The glycol is returned to the quenching tank 5 and the water is returned to the cleaning tank 8 for reuse in each.

[Problems to be Solved by the Invention] However, the above conventional structure has the following problems.

(1) When the liquid in the cleaning tank 8 is continuously fed to the separation tank 11 by the pump 9, a complicated liquid flow may occur in the separation tank 11 and a good separation action may not be performed due to nonuniform liquid temperature. . Therefore, in particular, since the water returned to the cleaning tank 8 contains glycol, the glycol cannot be completely recovered and the desired cleaning effect cannot be obtained.

(2) On the other hand, if the feeding to the separation tank 11 is performed intermittently, the heating in the separation tank 11, the subsequent temperature equalization and complete separation process are about 1.5 to 2 hours in an economical facility. Complete with. Therefore, if the liquid is fed every 1.5 to 2 hours, that is, the batch method is used, the problem (1) is solved. However, since the glycol in the quenching tank 5 gradually decreases and the glycol concentration in the cleaning tank 8 gradually increases during the process time, it cannot be said to be an essential solution. Therefore, it is conceivable to provide a plurality of separation tanks 11, but it is difficult to allow for facility economy, installation space, and handling.

(3) Therefore, it is effective when the quenching capacity, that is, the cycle time is very long, or when the quenching quality and the cleaning effect are compromised to some extent, but further improvement in productivity and cost reduction are strongly demanded. The problem is that it is not suitable for continuous processing equipment.

It is an object of the present invention to provide a quenching apparatus that can rapidly and continuously completely separate water and glycol and can recover and reuse all of the amounts.

[Means for Solving the Problems] The present invention is based on a number of actual machine operation analyzes, and if the liquid in the separation tank is at an appropriate temperature and there is no temperature non-uniformity depending on the part, the separation action is rapidly performed and it is radical. In view of the fact that the motion of mixing water and glycol once separated does not occur unless a liquid flow in the tank is generated, the liquid is fed to the separation tank after being heated to an appropriate temperature.

Specifically, a quenching tank for quenching by immersing the work heated to a high temperature in a quenching liquid in which water and glycol are mixed,
A cleaning tank that cleans the hardened work with water, and a separation that is made reusable by separating the water sent from this cleaning tank into water and glycol while holding it at an appropriate temperature In a quenching apparatus including a tank, heating means is provided in the middle of a feed pipe connecting the cleaning tank and the separation tank, and the heating means separates the liquid transferred in the feed pipe from the separation tank. It is configured such that the temperature can be raised to the appropriate temperature before reaching.

[Operation] In the present invention having the above-described configuration, the work heated to a high temperature in the heating furnace is immersed in the quenching liquid that is the glycol aqueous solution and rapidly cooled. The quenched work is subsequently conveyed from the quenching tank to the cleaning tank and cleaned. The quenching liquid adhering to the work is carried into the cleaning tank.

Here, the liquid in the cleaning tank is kept at an appropriate temperature in the separation tank,
Separated into water and glycol. At this time, the liquid fed to the separation tank is warmed by the heating means while being transferred in the feed pipe. At this time, since the amount of liquid heated by the heating means is a small amount unlike the amount of liquid stored in the separation tank, it is possible to easily and evenly heat the liquid, and at the same time, it is possible to randomly heat the transfer pipe. The liquid flow promotes uniform liquid temperature. Therefore, when the liquid is supplied to the separation tank,
Already in a uniform state and at a suitable temperature, it is completely separated into water and glycol immediately, water with a small specific gravity stays in the upper part, glycol with a large specific gravity accumulates in the lower part, and a quick and continuous good separation is achieved. Recovery action is performed.

Therefore, the separated water and glycol can be continuously collected and reused.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the main quenching apparatus comprises a heating furnace 1, a quenching tank 5, a cleaning tank 8 and a transfer means (not shown) for sequentially transferring the work W to the heating furnace 1 and each tank 5, 8. Separation and recovery means for separating and recovering water and glycol as quenching liquid for reuse
It is configured to have 10.

The heating furnace 1 heats a plurality of works W to around 500 ° C., and in this embodiment, is a hot air heating system. The heated work W is conveyed to the quenching tank 5 every time the door 2 is opened by the transfer means 3 such as a roller conveyor.

The quenching tank 5 contains a quenching liquid (glycol aqueous solution) in which water and glycol are mixed at a constant ratio, and quenches the immersed work W. The temperature of the quenching liquid is controlled by a temperature adjusting means (not shown) at around 35 ° C.
In addition, 6 is a riser and 7 is a circulation pump.

The cleaning tank 8 is for cleaning the work W after quenching with water. 9 is a feed pump.

Therefore, the work W heated at a high temperature is conveyed to the quenching tank 5 at regular intervals, and is cleaned in the cleaning tank 8 after the quenching process. After that, it is transported to a hot water tank or the like (not shown). Since the cleaning tank 8 cleans the work W by washing with water, it can be carried out not by the immersion method but by the spray method or the like.

Now, the separation / collection means 10 is a liquid in the cleaning tank 8 (a mixed solution of originally clean water and glycol brought in) [so-called drainage when the cleaning tank 8 is a spray system].
Is a means for separating water into glycol and water, and collecting and reusing each, and is roughly divided into a separation tank 11, a heating means 21, and a pipe 31.

The separation tank 11 stores a liquid heated to an appropriate temperature (for example, 85 ° C.), accelerates the separating action of water and glycol, and utilizes the difference in specific gravity between them to retain water in the upper layer and glycol in the lower layer. Is. The reserved water is sent to the cleaning tank 8 for reuse by the water pipe 34 forming a part of the pipe 31. On the other hand, glycol is returned to the quenching tank 5 through the glycol pipe 32 and reused. A flow rate adjusting valve 33 is provided in the glycol pipe 32 in order to keep the water-glycol mixing ratio of the quenching liquid in the quenching tank 5 constant. The make-up water for the quenching tank 5 is according to a conventional method.

Here, the heating means 21 is provided between the cleaning tank 8 and the separation tank 11,
That is, it is a means for heating the liquid from the cleaning tank 8 to an appropriate temperature (for example, 85 ° C.) in the middle of the feed pipe 35 connecting the two. The liquid supplied to the separation tank 11 is previously adjusted to an appropriate temperature.

In this embodiment, since the heating furnace 1 is a hot air heating system, it is configured as a gas-liquid heat exchange system.

That is, the exhaust pipe 4 of the heating furnace 1 is provided with a shell 27 containing the pipe heat exchanger 22, and the pipe heat exchanger 22 is attached to the cleaning tank 8.
To the separation tank 11 and is connected and disposed in the middle of the feed pipe 35.

Therefore, the liquid pumped by the pump 9 is discharged from the heating furnace 1 while flowing through the pipe heat exchanger 22, and the shell 2
7. The hot air exhausted to the atmosphere through the exhaust pipe 28 warms it to an appropriate temperature (specifically, a temperature higher by the cooling temperature until reaching the separation tank 11).

This optimum temperature control is performed automatically in accordance with the capacity of the feed pump 9 and the exhaust gas temperature so that the pipe heat exchanger can be controlled.
22 capacities have been defined. However, a control damper or the like may be positively provided. Of course, heating means 21
Since it is sufficient that the liquid from the cleaning tank 8 can be heated to an appropriate temperature before reaching the separation tank 11, another heating method using steam, electric power or the like as a heat source (for example, a heat exchanger using a panel heater) You may form as.

 Next, the operation will be described.

The work W heated to a high temperature (500 ° C) in the heating furnace 1
High quality quenching is performed by immersing in the glycol aqueous solution in the quenching tank 5 kept at a predetermined temperature (35 ° C.) for a predetermined time. Then, it is conveyed in the directions of arrows X and Y and cleaned in the cleaning tank 8. At this time, the quenching liquid in the quenching tank 5 adheres to the work W and is carried into the cleaning tank 8. Therefore, if this is left as it is, the concentration of glycol in the quenching tank 5 decreases and the concentration of glycol in the cleaning tank 8 increases, which causes inconvenience, but this problem is solved by the action of the separation and recovery means 10.

That is, the liquid in the cleaning tank 8 is pumped by the pump 9 and the feed pipe.
It is pressure-fed through 35, and is continuously fed into the separation tank 11 through the heating means 21 in relatively small amounts.

The liquid transferred in the feed pipe 35 is heated to an appropriate temperature (80 to 85 ° C.) by the exhaust heat of the heating furnace 1 while passing through the pipe heat exchanger 22. At this time, the amount of liquid heated by the heating means 21 is equal to the separation tank 11
Unlike the amount of liquid contained in the liquid, it is a small amount and can be heated easily and uniformly, and uniform liquid temperature is promoted by the random liquid flow when the liquid is transferred in the feed pipe 35. Therefore, when the liquid is supplied to the separation tank 11, the liquid is already in a uniform state and has an appropriate temperature, and immediately completely separates into water and glycol.

Therefore, in the separation tank 11, the separation action of water and glycol is performed rapidly and continuously at an appropriate temperature. After separation, water is retained in the upper layer and glycol is retained in the lower layer. Therefore, the newly replenished liquid of appropriate temperature immediately has a separating action in the appropriate temperature water of the upper layer. Since the amount of the replenishing liquid is small, it does not cause a disadvantage such as causing a large flow of the stirring liquid in the separation tank 11.

For this reason, the separation action is locally performed in the upper portion of the separation tank 11, but the water in the upper layer and the glycol in the lower layer are held in a stable manner as a whole.

Here, the water in the upper layer is sent to the cleaning tank 8 and the glycol in the lower layer is sent to the quenching tank 5 for reuse.

Therefore, according to this embodiment, the cleaning tank 8 and the separation tank 11 are
Since the liquid from the cleaning tank 8 is heated to an appropriate temperature for separating the liquid from the cleaning tank 8 into water and glycol during the transfer in the feed pipe 35 between The effect of separation, collection, and reuse with can be performed more reliably and smoothly. Therefore, high-quality quenching and the desired cleaning effect can be stably ensured, and overall cost reduction and productivity can be dramatically improved.

Further, since the liquid to be separated is supplied at an appropriate temperature, the separation operation of the separation tank 11 can be performed quickly and continuously, so that it is not necessary to provide a plurality of separation tanks 11 as compared with the conventional batch system, and the separation can be performed. The tank 11, the feed pump 9, the feed pipe 35, and the heating means 21 can be downsized.

Further, since the continuous separation / recovery method is used, the quenching liquid in the quenching tank 5 and the clean water in the cleaning tank 8 can always be maintained under desired conditions, and high quality products can be guaranteed from this point as well.

In addition, since continuous separation / recovery is a system that reuses the entire amount,
The wastewater treatment from the cleaning tank 8 can be further simplified and the operating cost can be reduced.

Further, since the heating means 21 effectively uses the exhaust heat of the heating furnace 1, it is economical to install a special heat source such as steam or electric power.

[Advantage of the Invention] The present invention provides a heating means in the middle of the feed pipe connecting the cleaning tank and the separation tank, and water and glycol before the heating means transfers the liquid from the cleaning tank to the separation tank. The water and glycol forming the quenching liquid can be separated, recovered, and reused quickly and continuously because it is configured to be heated to an appropriate temperature that separates into a stable and smooth high-quality quenching process. It is possible to provide an economical quenching device that is small in size, high in production efficiency, and economical.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention and a second diagram.
The figure is an overall configuration diagram of a conventional quenching apparatus. 5 ... Quenching tank, 8 ... Purification tank, 10 ... Separation and recovery means, 11
...... Separation tank, 21 …… Heating means, 35 …… Supply pipe.

Claims (1)

[Scope of utility model registration request] 1. A quenching tank for quenching a work heated to a high temperature by immersing it in a quenching liquid in which water and glycol are mixed, a cleaning tank for cleaning the quenched work with water, and this cleaning tank. In a quenching apparatus including a separation tank formed to be reusable by separating water and glycol while holding the liquid fed from a suitable temperature, the cleaning tank and the separation tank A heating means is provided in the middle of the feed pipe connecting the two, and the heating means is capable of raising the temperature of the liquid transferred in the feed pipe to the appropriate temperature before reaching the separation tank. Quenching equipment.